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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd58e4145de711f929acd3c67903e502f466e8b691de73d34349327245675ea6' 
  AND token = '0sOsV0aHgtTtLkZyVfUvu2iV3k1eWObceSQTKyo8Dkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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