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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22469b2c5770c8cf8d82b3868d0f8305669ddae4c61e81409ee5fce5dfaf2902' 
  AND token = 'OfjpmG/z0c2swk3JpmFBScI3Iwn3A8IyYkf88pNAseI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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