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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63d878ac0bd587aa3e4fab0ccd06b2360273699b5c70991a62185e2caf435b8' 
  AND token = 'nHcfAkIC1YKebFmZTKKNPtYI3FIIcxBQDmcuJ0kuOcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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