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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309040e9243c0a99bdeaed962c577edb0d1d9fe7a6f20c67e18bb676d79cbcb4' 
  AND token = 'b+bbAd9WggI1jU4weMTJysRblRqPY+k1UR7URLxpaFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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