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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4720fa8cc99b5d1399381a289ac101486147b9d3b0696473a8e74c01eee9bb' 
  AND token = 'hoiaoZ9NDH68d5WwQ2u1iazpbgeORnQMj1b1o2GNVO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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