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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30307981596baecb65d18057234bb44dd1d3b32f839290c24c47a1744a743db9' 
  AND token = 'MeixNWhupCAWI92yau3thFpP1ZTT7Ixo8Kptd8RH4rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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