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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b941ee195987e12e4b959aec5ee5d1f5851401aa3e5bfd86a574721dc72ba925' 
  AND token = 'fsQOksK/PpqdWTMS7/FAzUR3uxpOFrkGMr6d/4bF0S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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