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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e851c2e51a55656100b6be7ef8754fed5d54cb5872ce2f7ab4696698b1c63527' 
  AND token = 'bIaPWf3+PoVKOiHzToVbY/OMFtO1w7rgoT906lymksg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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