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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c534c4d84b17c9e55406e6154616760ca606b1d3c78e4c534418cdb5818a8f6d' 
  AND token = 'XARkL1Tn9eLhFZPxRNkP/HFALE+0UR+Ief4ac+lK/8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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