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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ef3c2bb2fdfea9aa9eddaccc3a720d2b2b664708b8b709ec264c24a87bf485' 
  AND token = 'x9pXJIOXz1Xmw34Yr4K0Dr1LI2bWGFeBUzFUXiKNMfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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