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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c6e1e4b1c56b6a17ac0b4cf482c0ea8f3c471f0ae9159cd2d07fa4994e4038' 
  AND token = 'DHf9FwYdxBy5b+j/GHjUhw4EpjoATLhum2Gat0xn8w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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