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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0def9a15a9728e229ba3f8f2cee67837bc75040d58150f3f6e4d17f796c88aa6' 
  AND token = 'NNC0QOnEpue4tVmc4LhqncJTuZJv6OAwLT4x4BNFFjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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