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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9551f752335da1d4057ee8ecdf94e2fcdc869756d438e22cd0ddaf3ce3529339' 
  AND token = 'OHbhTvX2dmYlYEqxtZ3Gc572228fGsHlpLFkRK4shb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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