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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415852b8c9bfeba76d1efbd8b1819e535798deb8ed48b751bde2dae8c652162e' 
  AND token = 'pt3JBE6+9o+yrQmQeiv08+HvmvNQk4C+25/GX7K8veM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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