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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27a5763f0a084f29ff2a9d3282f63955b0bbe8706d84823c1408f4dcc65177c4' 
  AND token = 'G7kEbjJz32MDNarsn8JVpBKKqE9qNKJmg8Uc5Q94070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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