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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfafe38e79720db61dba0c31a4380324ab91ef5ec559d45175b5d983cb5c9a2e' 
  AND token = 'U+p0ac8nJmFXe7VVfEnClcPG80NfSx7N4dX20MRoe5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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