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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e4206cbe7113e41c389157a470150f40323d2cd38717deb7564295bfe80879' 
  AND token = 'hK+s7Q99/ICWtVG/mQuvSDT2OTQJ/N1DqO43AuTsTQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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