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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0290c5118b1174085d1032ba4978dd6a0f9787046a4c069c4e1a6e334219128a' 
  AND token = '6HcNr8cqsnhMQlLK9XXd60fXEWZnB62WHNi3JcpXFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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