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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37cd606b6b0d6a1520006c58ad449b33e3ea157440f68d427df7bf57ff9e41c' 
  AND token = 'BawtQSHhzD46ERlXRK41P8MeAshboXMpH+BBx41Ap/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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