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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74b1a00447c831f2ba3e23b4e2a2a6911d9d992934e8390b334774bb8a97f6fc' 
  AND token = 'j8UghR6zX64DW42Yj/P4QSaRK/H2bIwDkbkCXl+5TAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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