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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c5bfd4fb725280fb96640ae89b0b636080892274c6c16f3013d13512e72960' 
  AND token = '55ZeF6H6SJWu4GlajE6L/zGeX6ovm2YMpgXiZRXU64Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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