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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8ce928692ad9de776522a6d23ce8e1bb9a27e67984d8ab625c18af5cff3f1f' 
  AND token = 'JBrybCLYDztvPi416kAaSXMImTEeP4wcid1QavfsCa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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