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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2615d258882bf5eb777a613559c1bee4dac889065d28368f0c8b5c01cf478be9' 
  AND token = '37qmXcupsc7IPh4txoYFiwrSuzDiPsUei2iIb9Ew/40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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