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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7be8aa0fef819360569999e4709a4cf1e4af53b4b0a27b60cda04b9871fecc7' 
  AND token = 'B1xW24weYTn6B3gweE2FTll67HBoP0yxM8RKvm6A/7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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