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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbbd7bd8f3132fdc21820ec49e2ed90601581a46d47d7656c7a2c2b023f4df0' 
  AND token = 'ItURnWrICW2pOqcX4l2DPu+vrLbNCNTNZK30jtSarUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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