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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0185b20e2d3acee9b474e4fff861861960ee4c760f66072dc9f535ffd749c1ba' 
  AND token = 'P5rkkovgJQ1SkkVCZIlVQPnXVTMBB8ACcMx9ikFdiWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00189

JSON explain

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