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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cb474ca55050b19814ef551566ae80edc20364cddfe9d2c06435733dd097618' 
  AND token = 'Ml8sagLZAcW9W8nl8XAPR3LLEXkbit9Ku68FQfbwnrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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