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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b91ab5b92d53407068e067bd966edf609dce6846f5a34f99f12f5d014b17782b' 
  AND token = 'Z1ey/abKoEHpdsOgp6uquApGNmCUoXREmYnoryMyMhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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