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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d7b70349680a32bf76362d7de3cc65ebdd9befd0ccd124af9cebbfd1eb9d4e' 
  AND token = 'ycVIuD3ILAsMKvH0kBPhlWT2l09qT8JX+izrzpAD+5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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