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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f22639d2a1eb3fb48bdec2ba410288173d09d1438850c0cb2ccc60645b087a5' 
  AND token = 'Jgoix6u+/9t4rMiqvcwV0u6bz0LmPtsEbGAYPTnEN4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}