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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7606b7f9dcfc9f6d80816c748f172f1a638ac0610ea27c69111249163c2106' 
  AND token = 'eKQ1g+PoHgtCsqqPUjIvtZRSygcudKWYZVqy/Tx1isw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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