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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d000210349d45d9016cf74c7a5de9f07555198d798240b2ab93848c560c74e' 
  AND token = '061BPRLA8X5+gTlsTHheMkBn4hfh2A+n6TNUPVM1Zd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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