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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98624007b1591c9738f85cabcef59bdf2dd88a308965ce61d97bc3d1bda7150a' 
  AND token = 'YoSwuQhsUyA4Ep0M7/6OCPwNGGUzVqnGySA05J3azL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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