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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530bbe8729f8605601ea43b15a1fdee44addb871915984c523150ede09c072f2' 
  AND token = 'sZi7f7G38JUEBUQPbRE1Yb7I6mCCTi7mzb8w4U+kazo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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