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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903c94049ee4abfef4fe1e7444e9a9a77b19535d9c956769736917426b2c90e7' 
  AND token = '+PI5oibUAuSnKnPnKNgDvrEn+XG4UzJRxpsNVAAwy2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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