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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de063e06e442edbc2f6297bd41e2ead5591b2a86fdab123c5c3f5cca0b4cca3' 
  AND token = 'Lko2uD+fUTKwB22gpmwOC/vgfpF5OnOV3NCkVxZK4j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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