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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8c161fbe7e4c5c30f806cb0b99e4bcdcebd926441f5e24619a1dc10dcf4530' 
  AND token = 'dHGsstTmTTh6WGN3P+6vDuu1Yj4baaCGCZL/ND439X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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