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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72e5453158764c36d908cb12dafad231fd988a9b3e34e7c6cb5075aa50b4a0a' 
  AND token = 'kl4IxoAufTAkXUjSyAj1p+x5QqXenkNpRhL87X13O2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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