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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f85e52d13e85b8d943d841f47c64b2a0edbe59a5f6a437fd8ab3ad5c05de9b4' 
  AND token = '6EjkPFtScTPtkxUaYF83q4mreuZi9qZeNxroDDUn2Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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