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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caef13fcf236311e1cb66feb9131aa6d997877782b09233151e00088cb8cf841' 
  AND token = 'e3SW9VfGchvl7So1i4GJE/efyBaUfpxfbRQdByX9T3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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