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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc413306ba163294526559efc4d936780e90bfae0eb54af8781265ba2dd251a4' 
  AND token = 'ss7Y7q1iYaPEAdxM8O0zsNFA90NPygmO59hB5AZsx9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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