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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ebcafff3ef562139e93e9db6883c17e112d013feee306b76b3f27cf2eb06a4' 
  AND token = 'Ogg4gNfYW940gXXupa9WD5EjoJglS/Epv9j6gqXTMCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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