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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3506a1a883f7005d5ca664e050d6f4929ec1db73be8a43422c5916c97af3a15' 
  AND token = 'hUs6Nmf2Nd3fmN/fcIEDnjQ2Rh+F+qutTYqhF6KOYLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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