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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6f329d8ff11fe15acbc6f67983fcf0782df6e4d7fd46803f7e44995dd2b7c4' 
  AND token = 'wZx1Z6/8tejuPX1zVTtzmBwEOJ5tRJ3j61hdmuO+ut8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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