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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0974cb87e95882512cc5369e3583379340327c82717ae446b1d3bd289c083d0b' 
  AND token = 'Zxlhbcu2hVOlFZVett3RIEIrYlIlm3HpmFbPMJkF92g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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