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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e2190a3c817fb01b0edfaab08c27c762fac15e956ba8620cde234dcee19b3f' 
  AND token = 'Gdhvi4xDMK1j0SNuFKIguB55uecWlAVOF4E6VflDCXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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