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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c58c1f3c4baeedfa25f90c320130cadfe1eeea11da6caa17ec877c945d195ef' 
  AND token = '+TgHGXYoP/LxIAeJdjFIzZnJ1AzQ1Jqs76LnnZg3K1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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